Sand conditioner



. Aug. 6, 1929. R. L. HAMLIN SAND CONDITIONER 3 Sheets-Sheew Filed Sept. 1, 1928 l llllllllllif N -hwm 1 rl mm M QM I .IIPIIII 0 RN Q 1 I Q m U m w W I M II we m: Q

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BY Q MA-E ATTORNEY Aug. 6, 1929. R. L. HAMLIN SAND CONDITIONER Filed Sept. 1928 5 Sheets-Sheet A ll INVENTOR R L.Hanain BY NQ. um...

ATTORNEY NJ W U WW Aug. 6, 1929. R. L. HAMLIN SAND CONDITIONER Filed Sept. 1, 1928 3 Sheets-Sheet 3 INVFINTOH Patented Aug. 6, 1929.

UNITED STATES RAY L. HAMLIN, OF STOCKTON, CALIFORNIA.

SAND CONDITIONER.

Application filed September 1, 1928. Serial No. 303,507.

This invention relates to foundry apparatus and particularly to a sand preparing and throwing machine for conditioning the sand used in castinganoulds.

The principal object of my invention is to provide a machine of this nature which while havin the general characteristics and fundamental principles of operation of the type of machine at present used, is constructed so that it is much easier for the foundry man to feed the sand into the same, has greater capacity for its size and the sand is more rapidly cleaned.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Fig. 1 is a sectional elevation of the complete apparatus.

Fig. 2 is a cross section on the line 22 of Fig. 1.

Fig. 3 is an enlarged sectional view of a sand throwing paddle and its special form of connection with its rotating arm.

Fig. 4 is a perspective view of a cleaning screen arrangement.

Referring now more particularly to the characters of reference on the drawings, the apparatus comprises a cast housing and frame structure 1 supported at its rear end by a pair of side wheels 2 and at its forward end by a swivel truck 3 to which a pull handle 1 is attached.

Mounted in the housing at its rear end is an electric motor 5 directlyconnected to a longitudinal shaft 6, said shaft turning adjacent its ends in bearings 7 mounted in the housing. The forward end of the housing 1 is formed as an open topped longitudinal trough 8, which delivers into the forward end of a cylindrical addle chamber 9 concentric with the sha t, and forming a part of the main housing structure intermediate the ends thereof. The rear end of the chamher 9 is closed, but said chamber has a large opening on one side as shown in Figure 2 for the purpose hereinafter seen.

A spiral screw conveyor 10 of common form is fixed on the shaft 6 and extends lengthwise in the trough 8 to deliver into the chamber.

Disposed above the shaft 6 in transverse vertical alinement therewith is a relatively short shaft 11 journaled in a bearing 'member 12 formed with the housing 1. This shaft driven at its rear end from the shaft 6 rearwardly of: the chamber 9 by a train of reduction gearing 13. Fixed on the forward end of the shaft 11 is a large disc 14, secured to and projecting forwardly from which is a barrel shaped screen drum 15 open on its forward end. This drum is longitudinally alined with the trough 8 and the conveyor 10 so as to discharge directly into the trough, and its bottom is adjacent the upper periphery of the conveyor so as to keep the bottom of the screen as low as possible.

By means of this construction it will be seen that the screen may be kept much lower than is the case when it has to discharge into the top of the paddle chamber as in the ordinary construction, thus making it much easier on the workers who have to shovel sand into the screen. At the same time the sand is positively and continuously fed to the chamber with no possibility of the sand piling up under the screen. A hood 16 over the driving mechanism as well as over the drum except at its open front end, protects such mechanism from direct contact with the sand.

Fixed on the shaft 6 in the chamber 9 are rigid radial arms 17 which support fiat radially extending transverse paddles 18 on their outer ends; the paddles projecting in close relation to the ends and periphery of the chamber.

The outer end of each arm has a boss 19 in which a pin 20 is mounted, which pin is concentric with the shaft 6. The adjacent paddle has a pair of longitudinally alined bosses 21 and 22 on its backface between which the boss 19 projects, the pin 20 being turnably mounted in the paddle bosses. The end of the boss 21 adjacent the boss 19 is bored larger than the pin to receive a helical spring 23, one end of which is secured to the boss 19 and the other end to the boss 21. In this manner the paddle is yieldably mounted so that it can give in the direction opposite to the direction of rotation of the arm, so as to avoid being damaged by contact with large pebbles and the like which may accidentally pass into the paddle chamber. Also the special mounting of the spring keeps the same and the pin enclosed and protected against damage.

A laterally extending discharge hous ng 24, open on the bottom projects to one slde of the machine from the open side of the chamber 9 and communicates with said (zlpen side; the usual verticall adjustable hoo 25 being swivelly mounte in connection with said discharge housing at its top and extending beyond the outer end of the same. Extending lengthwise of the machine ust in front of and at the bottom of the housing 24, is a horizontal bar 26 having transversely extending end members 27 slidably supported by the main housing structure. One of said end members is-pivotally connected to a link 28 which on its outer end carries an eccentric strap 29 engaging an eccentric 30 mounted on the shaft '6 between the rear end of the chamber 9 and the adjacent shaft bearing 7. By means of this arrangement the bar 26 will be reciprocated transversely in a direct horizontal plane and at motor speed.

Rigidl secured to and projectin upwardly fi'om the bar 26 is a vertica rectangular frame 31 across which a screen 32 of predetermined mesh is stretched. Supported at its ends in the housing 24 at the top and some distance inwardly from the screen 32 is a horizontal shaft 33, parallel to the bar 26, and from which a row of spaced bars 34 depend. These bars have an outward slant toward their lower ends and at such ends are secured in a horizontal bar or shaft 35. This bar is verticall slidable between the sides of U-sha ed yo es 36 secured to the bar 26 and isposed just inwardly of the bottom of the screen frame 31. By means of this construction it will be seen that the bar screen will be oscillated with the transverse movement of the screen 32 about the upper shaft 33 as an axis. This double screen arrangement and particularly the specific direction of its movements, provides for a more rapid and efiicient cleaning of the sand thrown thereagainst than is had with the ordinary vertical up and down movement. This is because the screen moves directly against the sand as it is thrown out b the paddle, thus jarring the sand more tli oroughly than is otherwise the case and causing same to be more easily broken up and the large particles segregated therefrom. The usual vertical deflector or baffle plate 37 projects upwardly from the bottom of the housing 34 a certain distance inwardly of the screen structure, while a catch trough member 38 is supported from the bar 26 and is disposed between said bar and bafile plate to catch the relatively heavy particles rejected by the screen structure.

. From the fore oing description it will be readily seen that have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the apppended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. A sand conditioner including a chamber having an opening, means in the chamber for discharging sand through the opening, a cylindrical and rotatable screen member set on a horizontal axis and open on one end to receive sand to to be screened therein, and means under the screen to feed sand discharged through the screen into the chamber.

2. A sand conditioner including a chamber open to one side, means in the chamber for dlschargin sand through the opening, a cylindrical and rotatable screen member set on a horizontal axis and open on one end to receive sand to be screened therein, and a screw conveyor extending under the screen and leading to an opening in one end of the chamber.

3. A sand conditioner including a chamber open to one side, means in the chamber for dlschargi sand through the opening, a cylindrical an rotatable screen member set on a horizontal axis and open on one end to receive sand to be screened therein, a screw conveyor extending under the screen and leading to an opening in one end of the chamber: and a common driving means for said chamber means, screen, and conveyor.

4. A sand conditioner including a cylindrical chamber open to one side and at one end, a shaft rojecting through the chamber centrally an beyond the open end thereof, a trougi leading to said open end, a screw conve or mounted on the shaft within the troug and a screen above the trough.

5. In a sand conditioner, a housing having a vertical outer-end opening, means for throwing sand horizontally through said opening, a screen across the opening, and means for reciprocating said screen horizontally to and from the opening.

6. In a sand conditioner, a housing having a vertical outer-end openin means for throwing sand horizontally t rough. said opening, a screen across the opening, and means for reciprocating said screen horizontally to and from the opening: a shaft turnably mounted in the housing at the top parallel to and inwardly of the screen, a screen structure secured to and depending from the shaft, and connecting means between the screen structure and first named screen for causing the former to be oscillated about the shaft as an axis with the reciprocating movement of the latter.

7. In a sand conditioner, a housing having a vertical outer-end opening, means for throwing sand horizontally through said opening, a screen across the opening, sup porting means for the lower end of the screen, means for reciprocating said support- 1ng means horizontally to and from the opening, a screen structure across the housing inwardly of the screen, means pivotally su porting said structure at the top from t e housing, vertically slotted yokes secured on the supporting means inwardly of the screen, and a bar provided with the lower end of the screen structure and vertically slidable in the yokes.

8. In a sand conditioner, an arm, a boss on the outer end thereof, a paddle disposed against one side of the boss, bosses on the back face of the paddle between which the arm-boss closely projects, a pin mounted in and connecting all said bosses, one of said paddle bosses, adjacent the arm boss having an enlarged bore, and a helical spring about the pin enclosed in said enlarged bore; one end of the spring being secured to the arm boss and the other end to the adjacent paddle-boss.

In testimony whereof I aflix my signature.

RAY L. HAMLIN. 

